I dont think the solution is what you wanted, if the arduino fails, you will not be able to turn the light on. It is good only to be able to override switches and turn lights off. I would like to come up with a full solution instead...
Anyone?
As mentioned, I prefer to use the RFM69HW, one reason is to be able to put a unit in the mailbox to notify when there's mail to picked up, and that is a little way off from the house...
S
